<style>
#Deenuqe{
font-family: Helvetica, sans-serif;
font-weight: 500;
font-style: normal;
font-size: 1.44rem;
line-height: 36px;
font-display: fallback;
color: #000;
background-color: #2D35BF;
float: left;
}
</style>
<body>
<div id="Deenuqe">
qqq
</div>
<script>
let Meuqeune = document.getElementById('Deenuqe');
Meuqeune.style = 'color: #FFF !important; background-color: #39A6A3 !important; ' ;
</script>
</body>